Cook County Sheriff’s office spokesman Frank Bilecki said the driver in the crash was an off-duty deputy driving a personal vehicle.

O’Malley was driving a 2011 Dodge 1500 pickup southbound on Mannheim Road, just past Belmont when the vehicle struck pedestrian Marcil Maris-Quevedo, 41, of the 3000 block of Prairie in Franklin Park, according to Franklin Park police.

A Franklin Park police sergeant said the driver was taken into custody following the crash.

Marias-Quevedo was pronounced dead at 3:29 a.m. Sunday at Loyola University Medical Center in Maywood, the Cook County Medical Examiner’s office said. An autopsy is scheduled for Tuesday. The medican examiner’s office listed his address in the 3000 block of Bright Street.